EP1162644A2 - Slim tube funnel design with improved funnel - Google Patents
Slim tube funnel design with improved funnel Download PDFInfo
- Publication number
- EP1162644A2 EP1162644A2 EP01113334A EP01113334A EP1162644A2 EP 1162644 A2 EP1162644 A2 EP 1162644A2 EP 01113334 A EP01113334 A EP 01113334A EP 01113334 A EP01113334 A EP 01113334A EP 1162644 A2 EP1162644 A2 EP 1162644A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- funnel
- reinforcement rib
- tube
- curved
- panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/861—Vessels or containers characterised by the form or the structure thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/86—Vessels and containers
- H01J2229/8603—Neck or cone portions of the CRT vessel
- H01J2229/8606—Neck or cone portions of the CRT vessel characterised by the shape
Definitions
- This invention relates generally to the field of cathode ray tubes, and, in particular, to the funnel portion of the cathode ray tube.
- SLIM tubes have put additional stress constraints on the funnel portion of the tube.
- a SLIM tube is one where the axial depth of the tube is substantially reduced, compared to a conventional picture tube, especially in the funnel portion.
- a conventional tube may have a deflection angle up to about 110 degrees, whereas a SLIM tube has a substantially larger deflection angle.
- the larger deflection angle is required because as the tube depth is reduced, electron guns are positioned closer to the front faceplate panel of the tube.
- the reduction of the tube depth is achieved by making the funnel portion and or the panel portion of the tube considerably shorter in the axial direction. As funnel depth is reduced, stresses in the funnel glass, caused by vacuum loading, are increased. The increased stresses result in a weaker tube envelope.
- the present invention is directed at reinforcement rib features in the glass funnel structure of a cathode ray tube.
- the rib features increase the tube's ability to withstand forces due to vacuum loading, manufacturing processes and safety testing, while keeping the tube weight minimal.
- the invention is especially useful in a SLIM tube design, or a tube with a large deflection angle, where the depth between the front faceplate panel and neck is reduced about 3 to 4 inches, compared to a conventional depth picture tube.
- the present cathode ray tube has a glass envelope including a faceplate panel, a neck end, and a funnel connected between the panel and the neck end.
- the funnel has a main body portion and a yoke region, with the main body portion including at least one reinforcement rib.
- the reinforcement rib includes a curved ridge bend in the funnel that is curved outward away from a vacuum side of said funnel.
- the reinforcement rib includes a curved mound-like increase in thickness of the funnel.
- the curved thickness can be directionally oriented inwardly towards the vacuum side, outwardly away from the vacuum side, or both.
- the reinforcement rib can extend along the funnel in a direction from the neck end towards the faceplate panel, along the funnel in a direction transverse to that from the panel to the neck end, or a combination of both directions.
- FIG. 1 shows a cathode ray tube having a glass envelope 10, comprising a faceplate panel and tubular neck 13 connected by a funnel.
- the funnel 12 includes a main body portion 12' and a yoke region 12" sealed to the neck 13.
- a plurality of reinforcement ribs 23 are located in the main body portion 12' of the funnel 12.
- the glass sidewall in the yoke region 12" is made thick enough to accommodate the higher tensile stress in the yoke region 12".
- the main body portion 12 ' being much larger than the yoke region 12" is the logical area to remove glass and achieve substantial glass reduction. Therefore, thinning of glass in the main body portion 12' requires reinforcement against tensile stress.
- the ribs 23 shown are oriented longitudinally from the neck 13 toward the front faceplate panel 11 along the main body portion 12'.
- Reference to rib 23 is merely exemplary.
- Other rib details 33, 43, 53 and 63 can be employed on the funnel glass alone or in combination with each other.
- FIGS. 2-6 cross-section elevation views of different reinforcement rib configurations are shown.
- an external reinforcement rib 23 in the glass is formed by a curved ridge bend in the glass directed outwardly away from the vacuum side 21 towards the outside or ambient air side 22 of the funnel.
- bend transitions 24-27 to and from the rib 23 are gradual and curved, as opposed to acute angular changes where stress from vacuum loading would concentrate.
- the cross-section detail 30 of FIG. 3 shows a reverse ridge bend 33 curved inward toward the vacuum side 21 of the glass and away from the ambient air side 22.
- a rib 43 is formed by increasing the funnel glass thickness with a mound-like or curved protrusion extending inwardly towards the vacuum side 21 and away from the ambient air side 22.
- a rib 53 is formed by increasing the funnel glass thickness with a mound-like or curved protrusion extending outwardly in a direction away from the vacuum side 21 and towards the ambient air side 22 of the funnel.
- a rib 63 is formed with the glass thickened with mound-like or curved protrusions 63 towards both the inside or vacuum side and the outside or ambient air sides 21, 22 of the funnel glass.
- FIGS. 7-9 exemplary locations and orientation of the reinforcement rib features of FIGS. 2-6 on the funnel portion of the cathode ray tube are illustrated in FIGS. 7-9.
- Each of the various rib configurations 23, 33, 43, 53 and 63 can be employed alone or in combination with each other on the funnel.
- rib detail 23 and rib detail 43 can be located simultaneously at different locations on the same funnel glass.
- the ribs 23 are oriented transverse to the longitudinal direction of the funnel surface.
- cathode ray tube 80 of FIG. 8 there are ribs 23' oriented in the longitudinal direction along the funnel surface and ribs 23 oriented in a direction transverse to the longitudinal direction of the funnel surface.
- the transverse and longitudinal oriented ribs 23', 23 are configured in an exemplary hub and spoke pattern, but other interconnected rib patterns can be used.
- Curvature in the funnel portion of a typical tube serves to cause forces acting on the glass funnel to induce the greatest stress or strain in the direction of the glass surface.
- curvature in the funnel portion is reduced which tends to concentrate stress in funnel portions having greatest angular or directional change and induces greater bending stress in funnel portions that become less curved as the tube depth is reduced.
- Strains in the tube glass from vacuum loading are tensile in nature. Reducing these strains can be accomplished by the inventive rib features, shown in FIGS. 2-6, on the funnel. For example, where tensile stress induced by a vacuum is 1500 psi, incorporating ribs to the funnel glass can reduce that tensile stress to a level below 1000 psi, which is acceptable and safe.
- the inventive reinforcement ribs properly located on the tube's funnel surface increase the tube's ability to withstand forces due to vacuum loading, manufacturing processes and safety testing.
- the rib features require a minimal amount of additional glass to achieve the added glass strength.
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
Description
- This invention relates generally to the field of cathode ray tubes, and, in particular, to the funnel portion of the cathode ray tube.
- Flat tube designs have necessitated changes in the design of glass envelope components used in a display tube. Flat tubes, for example, have required an increase of greater than one inch in the thickness of the glass in the center of the front faceplate panel. Further tube designs known as "SLIM" tubes have put additional stress constraints on the funnel portion of the tube. A SLIM tube is one where the axial depth of the tube is substantially reduced, compared to a conventional picture tube, especially in the funnel portion.
- Making the front panel flat and reducing the depth of the tube has resulted in a need to increase the glass thickness of the tube to accommodate additional mechanical stresses. Although increased glass thickness has become an accepted industry practice, efforts are underway to reduce the amount of glass needed for the tube envelope. The funnel portion of the tube has always been about 50% of the weight of the tube, but the funnel is considerably thinner in cross-section than the faceplate panel because of the greater curvature of the funnel. Thickness distribution within the front faceplate panel and funnel are dictated by the strength and safety considerations in tube construction.
- In a SLIM tube, the electron beam must be scanned over a wider deflection angle, compared to a conventional tube. For example, a conventional tube may have a deflection angle up to about 110 degrees, whereas a SLIM tube has a substantially larger deflection angle. The larger deflection angle is required because as the tube depth is reduced, electron guns are positioned closer to the front faceplate panel of the tube. The reduction of the tube depth is achieved by making the funnel portion and or the panel portion of the tube considerably shorter in the axial direction. As funnel depth is reduced, stresses in the funnel glass, caused by vacuum loading, are increased. The increased stresses result in a weaker tube envelope. Forces on the surface areas of the funnel, including the yoke portion, increase to where processing the funnels through frit application and exhaust cycles becomes difficult. Additionally, the glass areas on the funnel can become failure points during implosion testing. While it is economically desirable to provide a cathode ray tube having a reduced depth with minimal glass weight, stress and safety constraints must still be met.
- The present invention is directed at reinforcement rib features in the glass funnel structure of a cathode ray tube. The rib features increase the tube's ability to withstand forces due to vacuum loading, manufacturing processes and safety testing, while keeping the tube weight minimal. The invention is especially useful in a SLIM tube design, or a tube with a large deflection angle, where the depth between the front faceplate panel and neck is reduced about 3 to 4 inches, compared to a conventional depth picture tube.
- The present cathode ray tube has a glass envelope including a faceplate panel, a neck end, and a funnel connected between the panel and the neck end. The funnel has a main body portion and a yoke region, with the main body portion including at least one reinforcement rib. The reinforcement rib includes a curved ridge bend in the funnel that is curved outward away from a vacuum side of said funnel. Alternatively, the reinforcement rib includes a curved mound-like increase in thickness of the funnel. The curved thickness can be directionally oriented inwardly towards the vacuum side, outwardly away from the vacuum side, or both. The reinforcement rib can extend along the funnel in a direction from the neck end towards the faceplate panel, along the funnel in a direction transverse to that from the panel to the neck end, or a combination of both directions.
-
- FIG. 1 is a side elevational view of a cathode ray tube;
- FIGS. 2-6 are cross-section views of inventive rib features in the glass of the cathode ray tube;
- FIGS. 7-8 are side elevational views of cathode ray tube envelopes showing exemplary locations and orientations of the inventive rib features of FIG. 2-6.
- FIG. 9 is a rear view along the line 9-9 in FIG. 8.
-
- Similar reference characters refer to similar parts in each of the FIGURES of the drawings.
- FIG. 1 shows a cathode ray tube having a
glass envelope 10, comprising a faceplate panel andtubular neck 13 connected by a funnel. Thefunnel 12 includes a main body portion 12' and ayoke region 12" sealed to theneck 13. A plurality ofreinforcement ribs 23 are located in the main body portion 12' of thefunnel 12. In a conventional tube, the glass sidewall in theyoke region 12" is made thick enough to accommodate the higher tensile stress in theyoke region 12". The main body portion 12 ', being much larger than theyoke region 12", is the logical area to remove glass and achieve substantial glass reduction. Therefore, thinning of glass in the main body portion 12' requires reinforcement against tensile stress. Theribs 23 shown are oriented longitudinally from theneck 13 toward thefront faceplate panel 11 along the main body portion 12'. Reference torib 23 is merely exemplary.Other rib details - Referring to FIGS. 2-6, cross-section elevation views of different reinforcement rib configurations are shown. In the cross-section detail 20 of FIG. 2, an
external reinforcement rib 23 in the glass is formed by a curved ridge bend in the glass directed outwardly away from thevacuum side 21 towards the outside orambient air side 22 of the funnel. Preferably, bend transitions 24-27 to and from therib 23 are gradual and curved, as opposed to acute angular changes where stress from vacuum loading would concentrate. Thecross-section detail 30 of FIG. 3 shows a reverse ridge bend 33 curved inward toward thevacuum side 21 of the glass and away from theambient air side 22. - In the
cross-section detail 40 of FIG. 4, arib 43 is formed by increasing the funnel glass thickness with a mound-like or curved protrusion extending inwardly towards thevacuum side 21 and away from theambient air side 22. In the FIG. 5 cross-section detail 50, arib 53 is formed by increasing the funnel glass thickness with a mound-like or curved protrusion extending outwardly in a direction away from thevacuum side 21 and towards theambient air side 22 of the funnel. Lastly, in the FIG. 6cross-section detail 60, arib 63 is formed with the glass thickened with mound-like orcurved protrusions 63 towards both the inside or vacuum side and the outside orambient air sides - Additionally, exemplary locations and orientation of the reinforcement rib features of FIGS. 2-6 on the funnel portion of the cathode ray tube are illustrated in FIGS. 7-9. Each of the
various rib configurations rib detail 23 andrib detail 43 can be located simultaneously at different locations on the same funnel glass. - In the
cathode ray tube 70 of FIG. 7, theribs 23 are oriented transverse to the longitudinal direction of the funnel surface. In cathode ray tube 80 of FIG. 8, there are ribs 23' oriented in the longitudinal direction along the funnel surface andribs 23 oriented in a direction transverse to the longitudinal direction of the funnel surface. As can be seen from the rear view 90 in FIG. 9, taken along line 9-9 in FIG. 9, the transverse and longitudinaloriented ribs 23', 23 are configured in an exemplary hub and spoke pattern, but other interconnected rib patterns can be used. - The above described reinforcement ribs in the funnel glass surface make the funnel stronger and more resistant to impact and vacuum loads, as well as permitting the tube to withstand applied pressures during manufacturing processes and testing. In finite element analysis (FEA), stress models of tubes with the above ribs, incorporated into the funnel, stress due to vacuum load was shown to be reduced.
- Curvature in the funnel portion of a typical tube serves to cause forces acting on the glass funnel to induce the greatest stress or strain in the direction of the glass surface. In a SLIM tube design where the depth between the
front panel 11 andneck 13 is reduced, curvature in the funnel portion is reduced which tends to concentrate stress in funnel portions having greatest angular or directional change and induces greater bending stress in funnel portions that become less curved as the tube depth is reduced. Strains in the tube glass from vacuum loading are tensile in nature. Reducing these strains can be accomplished by the inventive rib features, shown in FIGS. 2-6, on the funnel. For example, where tensile stress induced by a vacuum is 1500 psi, incorporating ribs to the funnel glass can reduce that tensile stress to a level below 1000 psi, which is acceptable and safe. - The inventive reinforcement ribs properly located on the tube's funnel surface increase the tube's ability to withstand forces due to vacuum loading, manufacturing processes and safety testing. The rib features require a minimal amount of additional glass to achieve the added glass strength.
- It will be apparent to those skilled in the art that, although the invention has been described in terms of specific examples, modifications and changes may be made to the disclosed embodiments without departing from the essence of the invention. Accordingly, reference should be made to the appended claims, rather than to the foregoing specification, as indicating the true scope of the invention.
Claims (9)
- A cathode ray tube having a glass envelope (10) comprising:a faceplate panel (11);a neck end (13); anda funnel (12) connected between said panel (11) and said neck end (13), said funnel having a main body portion (12') and a yoke region (12"), said main body portion including at least one reinforcement rib (23).
- The tube according to Claim 1, wherein said reinforcement rib comprises a curved ridge bend (33) in said funnel being curved inward toward a vacuum side (21) of said funnel.
- The tube according to Claim 1, wherein said reinforcement rib comprises a curved ridge bend (23) in said funnel being curved outward away from a vacuum side (21) of said funnel.
- The tube according to Claim 1, wherein said reinforcement rib comprises a curved mound-like increase (43, 53, 63) in thickness of said funnel.
- The tube according to Claim 4, wherein said mound-like increase (53) in thickness is directionally oriented towards an ambient air side of said funnel.
- The tube according to Claim 1, wherein said reinforcement rib comprises mound-like increases in thickness (63) in said funnel directionally oriented to both inside and outside of said funnel.
- The tube according to Claim 1, wherein said reinforcement rib (23) extends along said funnel in a direction from said neck end towards said faceplate panel.
- The tube according to Claim 1, wherein said reinforcement rib (23) extends along said funnel in a direction transverse to that from said panel to said neck end.
- The tube according to Claim 8, wherein a first of a plurality of said reinforcement rib (23) extends along said funnel from said panel towards said neck end, and another plurality of said reinforcement rib (23') extends along said funnel in a direction transverse to that for said first plurality of said reinforcement rib.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US58710200A | 2000-06-02 | 2000-06-02 | |
US587102 | 2000-06-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1162644A2 true EP1162644A2 (en) | 2001-12-12 |
EP1162644A3 EP1162644A3 (en) | 2003-11-05 |
Family
ID=24348356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01113334A Withdrawn EP1162644A3 (en) | 2000-06-02 | 2001-06-01 | Slim tube funnel design with improved funnel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1162644A3 (en) |
JP (1) | JP2002033060A (en) |
KR (1) | KR20010110113A (en) |
CN (1) | CN1328338A (en) |
MX (1) | MXPA01005525A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003034461A1 (en) * | 2001-10-17 | 2003-04-24 | Asahi Glass Company, Limited | Glass funnel for cathode ray tube and cathode ray tube |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100770169B1 (en) * | 2006-01-27 | 2007-10-26 | 주식회사 팬택 | Refraction hinge device and personal portable device using the same |
CN110990945B (en) * | 2019-11-15 | 2022-05-06 | 武汉理工大学 | Design method for bionic structure of automobile roof reinforcing rib |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2232098A (en) * | 1938-02-11 | 1941-02-18 | Hygrade Sylvania Corp | Cathode ray tube |
FR867824A (en) * | 1938-09-07 | 1941-11-29 | Telefunken Gmbh | Braun tube, especially for television |
GB786640A (en) * | 1953-10-23 | 1957-11-20 | Philips Electrical Ind Ltd | Improvements in or relating to a vacuum vessel such as a cathode ray tube or a largerectifying tube having a metal wall which is made at least partly from thin sheet metal |
US2825129A (en) * | 1951-01-20 | 1958-03-04 | Mcdowell Mfg Co | Television cone construction |
US2969162A (en) * | 1957-04-22 | 1961-01-24 | Kimble Glass Co | Molded picture tube |
JPH03263738A (en) * | 1990-03-13 | 1991-11-25 | Mitsubishi Electric Corp | Cathode-ray tube device |
-
2001
- 2001-05-29 KR KR1020010029596A patent/KR20010110113A/en not_active Application Discontinuation
- 2001-05-31 JP JP2001164718A patent/JP2002033060A/en not_active Withdrawn
- 2001-06-01 EP EP01113334A patent/EP1162644A3/en not_active Withdrawn
- 2001-06-01 MX MXPA01005525A patent/MXPA01005525A/en unknown
- 2001-06-04 CN CN01121196A patent/CN1328338A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2232098A (en) * | 1938-02-11 | 1941-02-18 | Hygrade Sylvania Corp | Cathode ray tube |
FR867824A (en) * | 1938-09-07 | 1941-11-29 | Telefunken Gmbh | Braun tube, especially for television |
US2825129A (en) * | 1951-01-20 | 1958-03-04 | Mcdowell Mfg Co | Television cone construction |
GB786640A (en) * | 1953-10-23 | 1957-11-20 | Philips Electrical Ind Ltd | Improvements in or relating to a vacuum vessel such as a cathode ray tube or a largerectifying tube having a metal wall which is made at least partly from thin sheet metal |
US2969162A (en) * | 1957-04-22 | 1961-01-24 | Kimble Glass Co | Molded picture tube |
JPH03263738A (en) * | 1990-03-13 | 1991-11-25 | Mitsubishi Electric Corp | Cathode-ray tube device |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 016, no. 073 (E-1169), 21 February 1992 (1992-02-21) -& JP 03 263738 A (MITSUBISHI ELECTRIC CORP), 25 November 1991 (1991-11-25) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003034461A1 (en) * | 2001-10-17 | 2003-04-24 | Asahi Glass Company, Limited | Glass funnel for cathode ray tube and cathode ray tube |
US6919677B2 (en) | 2001-10-17 | 2005-07-19 | Asahi Glass Company, Limited | Glass funnel for a cathode ray tube and cathode ray tube |
Also Published As
Publication number | Publication date |
---|---|
JP2002033060A (en) | 2002-01-31 |
MXPA01005525A (en) | 2003-08-20 |
KR20010110113A (en) | 2001-12-12 |
CN1328338A (en) | 2001-12-26 |
EP1162644A3 (en) | 2003-11-05 |
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